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Extractability and extraction mechanism of lanthanide ions were investigated by using a new extractant,N,Nn,N′,N′-tetrabutyl-3-oxa-diglycolamide(TBDGA),in toluene from nitric acid media.The effects of HNO_3 and TBDGA concentrations,and temperature,on extraction of lanthanide ions were studied.Stoichiometrics of the main extracted species were HNO_3·TBDGA and M(NO_3)_3-3TBDGA(M = Er,Dy,Tb,Gd,La,Ce,Nd,Sm and Eu).The extracted species for metal ions were established to be ionic complex.In this complex,nitrate anion was not coordinated to the central ion.The extraction pattern increased gradually across the lanthanide ions series,showing enhanced affinity of TBDGA toward heavy lanthanide ions.Thermodynamic parameters were investigated for the exothermic extraction reaction.
Extractability and extraction mechanism of lanthanide ions were investigated by using a new extractant, N, Nn, N ’, N’-tetrabutyl-3-oxa-diglycolamide (TBDGA), in toluene from nitric acid media. The effects of HNO 3 and TBDGA concentrations , and temperature, on extraction of lanthanide ions were studied. Toichiometrics of the main extracted species were HNO_3 TBDGA and M (NO_3) _3-3TBDGA (M = Er, Dy, Tb, Gd, La, Ce, Nd, Sm and Eu ) The extracted species for metal ions were established to ionic ionic. In this complex, the nitrate anion was not coordinated to the central ion. In this complex, the anion anion was not coordinated to the central ion. The enhanced pattern of increased adsorption of TBDGA toward heavy lanthanide ions. Thermodynamic parameters were investigated for the exothermic extraction reaction.